Hi, Thanks very much for the patience so far. It's because I didn't do `wl_display_flush` before polling.
Regards, SZ Le jeu. 15 mars 2018 04 h 41, Pekka Paalanen <ppaala...@gmail.com> a écrit : > On Thu, 15 Mar 2018 00:19:10 +0000 > Sichem Zhou <sichem...@gmail.com> wrote: > > > Dear Pekka, > > > > Thanks for your idea on this, I inserted a callback in the > `surface_commit` > > function in libweston. From the log I can see that the `surface commit` > was > > blocked on the server side until some other events happen. On the client > > side it was clear that I committed two buffers then sleeped because of > > lacking available buffers. I am using libweston and currently I didn't > > setup any input callbacks. All I did was setting up an interface to set > > views in background layers then call `wl_display_run()`. I hope to know > is > > there anyways to follow wayland server event queues in libweston? > > Hi, > > there is only one event queue in the server-side per client. IIRC, it's > not really even a queue as much as just a buffer. > > You can use WAYLAND_DEBUG=server environment variable to have > libwayland-server print all protocol messages at the time they are > processed. That means, the time when requests are being dispatched, and > events are being queued for sending. There is WAYLAND_DEBUG=client > working the same way for clients, but it might be confusing if it is > set for multiple clients at the same time. > > If you need to check the messages on "the wire" instead, the Wayland > website extras have a list of some debugger programs. Messages enter > the wire on flush after send. Forgetting to flush will show the message > in WAYLAND_DEBUG=1 output, but it might not be actually sent at the > time. > > This issue could also be a client bug. If you do not ensure that all > requests have been flushed out before going to sleep in poll(), they > might never actually reach the server until something else happens. > > > Thanks, > pq >
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